WUFI® is a software family that simulates heat and moisture transport in buildings, used by professionals worldwide for 25 years. It helps with damage-free construction and renovation work, and complies with standards. The WUFI® Plus range is being extended with web-based applications by C3RRO, a spin-off of Fraunhofer IBP, to plan sustainable and energy-efficient buildings efficiently and cost-effectively. The spin-off provides advanced building physics simulation models and expertise in simulating building energy, comfort and sustainability. Both C3RRO and Fraunhofer IBP will work together on WUFI® Plus calculations, developments and research.